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@eine faire etent @ffice JOHN P. HART, OF OHIOAeO, ILLINOIS.l Letters PatentrNo. 62,745, dated M'areh 12, 1867.

IMPROVED RILWAY FROG.

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Be itknown that I, JOHN P. HART, of Chicago, in the county of Cook, audState of Illinois, have invented a new `and useful improvement in Frog for Railroad Tracks; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and letters of reference marked thereon, making a part of this specificatiomiin which- Figure I is a plan View of my frog.

Figure II is a vertical section taken through the red line :e x.

Figure III is a vertical section taken through the red liuc z z.

The nature of my invention consists in making a series of grooves in the frog, below the flange track, ih order to allow the larger wheels ofthe trucks to pass through the frog, when wheels of diferent sizes are used on the same asie for the purpose of running on roads of different gauges. It is evident that when the smaller wheels are running upon the track the larger Vwheels would come in contactwith the frogs, as now constructed; but by cutting enough of the frog away to clear the larger wheel on the axle, it will pass through the frog when thc smaller wheel is running on the rail in the usual manner. The wantof a frog suitably constructed to allow compound wheels to run over the road rendered James lVrights patent of 1829 inoperative, and all other-inven. tions'o'f similar character. I claim that by the luse of my frog diterentsized wheels on car axles can be made practical so as to run on reads of diierent gauges, thereby saving much labor and expense in the transfer of freight. i

To enable others skilled in the art to make and use my invention7 I will describe its construction and how it may be used. I

D represents the bed of the common frog, resting upon the tie shown by the red lines w, Fig. III. A shows -the frog-rails, connectedfwith the guides B in the usual manner. B is the V, resting upon the flange-track F E. The red lines c show the position' of the T-rails when connected with the frog, all of which is a common construction of frog for railroads. G showsthe grooves or channels which I make between the Hange-track F und the guides B, for the` larger wheel of the truck to pass through the frog when the smaller wheel is passing over the frog in the usual manner. The frog represented' in the drawing is calculated only for asingle angle of road7 but my improvement can be used in frogs for roads that cross each other at any angle,l and all other places where frogs are used, by simply making the Vgrooves Gr, or cutting away vthat portion of the frog which would come in contact with the larger wheel. It is not necessary that the frog 4be constructed precisely as that shown in' the drawing, the main object being to allow the larger wheel to pass through and yet leave the frog as strong as possible. I use the sanne material in the construction of the frog that is now employed for such purposes.

Operation.

After the frog has been constructed :is set forth, and adjusted in the track as shown at Fig. I, the wheels of the truck will occupy the position on the frog shown by the red lines H, III, l being the larger wheel and 2 the smaller wheel:

Having thus fully described 'my device, what I claim as new, and desire to secure by Letters Patent of the United States, is- V The grooves Gr for allowing compound wheels to pass through the frog, substantially as set forth.

JOHN I. HART.

Witnesses:

GEO. L. GHAPIN, A. HAYWARD. 

